Goodwill and Mortgage Servicing Rights - Mortgage Fees and Related Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Risk management:
All other	$ 0	$ 0
Mortgage fees and related income	396	465
Consumer & Community Banking
CCB mortgage fees and related income
Net production revenue	200	95
Operating revenue:
Loan servicing revenue	404	513
Changes in MSR asset fair value due to collection/realization of expected cash flows	(199)	(160)
Total operating revenue	205	353
Risk management:
Changes in MSR asset fair value due to market interest rates and other	(301)	382
Other changes in MSR asset fair value due to other inputs and assumptions in model	2	2
Change in derivative fair value and other	290	(367)
Total risk management	(9)	17
Total net mortgage servicing revenue	196	370
Mortgage fees and related income	$ 396	$ 465